Originally Posted by sc00by4life
There is NO correlation between blown ringlands. They happen on tuned cars. They happen on stock cars. Noone really knows at this point.
I think the fact Subaru chose to use the wrong material for the pistons has something to do with it. Lots of data supporting the fact hypereutectic pistons don't hold up well in FI applications. They're strong, but also brittle. Doesn't take much of a detonation event to crack a ringland, which is one of the most brittle parts of the piston because the material is very thin there. A tune helps to prevent detonation, but not 100% of the time. The best tune in the world can't always compensate for poor fuel quality or fuel with too low of an octane rating for the tune.